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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5015635e5d1e7a9008ad314c962ff8e0d6e9a755784f794779c1e7e97f8ec1fe' 
  AND token = 'tIiuhj8ohvhfCYZu32xPhTWnvQIm4CR5rDSBREmEKlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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