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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '224e204da60fed474710dfb9839ef358f642da37d784ad9a44c45bcfcd39f929' 
  AND token = '8/TWcMW0WxcnUDbT1v+T5lxZtmBu1Lo4DaXYVEYHhxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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