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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbab57d1df4dc39c294733a140ebf856e9ba210fbbe89b79185724e6fe3bdaa1' 
  AND token = 'W/boCIb8I6B4phHM0Ochr6bMn32pycz1EmagAIUlxmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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