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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc9ac51bee6d8e27ff5036a753dce51810fee8d05b9f77815c6eb52f913cc52' 
  AND token = 'zWSOk2xElKiJeeSgnN8CjEmT5nkvb9cDWBM5a5KFA58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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