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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9134af3c86aeacdc5dbb6fe41ddc14824c10444b1327327e0199f01412ec09fe' 
  AND token = 'eeD1wlfSBGByTcisfhUlJfnr6ZVFN8gcc/dJSK8mZKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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