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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d67f2a517ad97b8bf3db70c68c6a33e2102ad22698be42a89726826f7999751' 
  AND token = 'yJ8TVF+9X95s1WAm3CLjUfbER7OxqePxdqVhbAA4Q7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}