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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc5add39189628082bee938c3e54297107f49e73fcc638062c75b5e0575aa7a' 
  AND token = 'YV1wRHfFj5QM7Xe4qxM5cCrOjKej8ThMlZ7+T29ep8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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