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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bcb6bab39daed3b001845da8b54c60ac45ce7a5a7a6a2db74b87a53a4eb59c6' 
  AND token = 'nNT8GqpGOlCBHBmWISVJYgiKkPxHpp7VJc5cruWmWOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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