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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7c368d79cb030536df4f8cdd22efa77308c86063dd3266f82e8c90ae8f4ab4' 
  AND token = '/1yEj3moY7suRTSyT3jzWEGi2St51gbJjbhbDBTK5Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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