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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3204f4b1a678d2c39f2f88ba93c8d1e76d4af8396c1bd6a4206066cfdf4641b1' 
  AND token = 'l3zwfpeLR7xQ8iqmUAC5bdwUO1lO7MhKnIWyH7Ehlqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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