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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '422bbba5ab02a40b41d2314b3d1cd75bf4b64f1bd155c4c7cb8ad59899d4b5f6' 
  AND token = 'LI4Xb242GPCYhTkg0x8sLZ+LUMPlth7Q1B7NAOc9ULs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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