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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2135eba0b8838991101e7f08feb49297142941c07f07719fb7b13b4cf07f9a' 
  AND token = '+8PXYsu5dZUvigomMNYfErX6iAwFecoOIRaYaPUdcuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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