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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b7483ce3ce298368731246a9223094aa45856fd1df6d4b3946d04b034b3536' 
  AND token = 'NRkM7s1YiHgBi7h8ajWtWWyhU4I/rP3dEauF8MEHdtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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