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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c578bee7faef9f4f701f907648c7727ac5826d31f0eea160a73ea99b3e966af' 
  AND token = 'vLfLF191LxOr0b3/1f8PnWSTDlv9SOZMiDp0WyP/340=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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