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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c991a64e5147d7c394a91e819d91886a87c27df1c9a1195089303812cea5ff4' 
  AND token = 'xifaHwqEJWMJ4rYATD0wQiWSqV48g3S0usQdeX1vkMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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