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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e5c97c2c5988d72724d4050b77f52a56dbe97004ba0cd678a0d481c5e77ab1' 
  AND token = '8j0LOogr9NC/EGwLGLMX/yJjEyNnxf0upT0OA4+sG1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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