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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7cdc108b8d62ca8c62553f45c002a9956d648544c31dd29696f98ef5d7ecf4' 
  AND token = 'm0pEdXMrJZsZpOw4pOQnQG5u/9q9CiN2yZ1axI3XcoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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