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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257a58b150ad045f277070c99a46ba418a612215b82c44ad0ee866b40a17d15f' 
  AND token = 'yr3rUV0nuwoPMM6Gl6joObe2KovutvYd0YsiatOTxzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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