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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7be7a2b22b9dc0fe1aa303e242c162ab9598ecb945329db6dc42502bead3c4a' 
  AND token = '1keLTyjHTwERWJmslSRJO9BVJr+s7lj48DalGsTH6aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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