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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee447e2fd72c9f58c3bdcbd1cc3f6b764cb48dbbf999c29ab0a25201ded59f2' 
  AND token = 'Wlr6c52KW9q1HNZteCIjS3//k+n93nUCf1Z1OKwVIis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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