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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459a44d6ad7abac5c3e87f7334af7123c2cd664e9bbbe75baf9480e8b7dd2096' 
  AND token = 'xGlA6lctfGajlpyeuazSKwBy8fC6G2FxjOshW+k6eGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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