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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd34b17f72544f881d9db7c4ac95d39357a4bc588b482a3c85cbaae7fdb8d813' 
  AND token = 'oLwAAKn2wmF5coqoNouZ7p8gZVH09Aq5slyUnLVb1Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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