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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8763ef0fe60b37dddb819aa0b48f94694f9293c63604ea845522a29d41cf58b' 
  AND token = 'A5bRBoBQnLc6GZ5QOgASj7s8vlcT/PO2jTd3Ecv1uEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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