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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54823d33a916702c04d314cafd4fbc1bc4834d705c6be0782ce75eda4f99db0a' 
  AND token = 'BX7HFHa+87NOZbUcwBDS9EY4X4YHgmxKhkGb+inX5yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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