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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48db24fd54dbfd7cec66f25b9b9f845c4ca24ba48a0f8ca43d042684c14aa8c' 
  AND token = 'HXjwjWLWPRD+FCyoFD7sm1R+ty/BwT4vixH1miroH2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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