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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9461e6452a66e7a92ad75f974fd7913cc47d20f81dff14de7e9c80abdf98a0e' 
  AND token = 'kJMnamsl0OG/0CJ0EKMP2huCZA7LgYlcqds7n6HzLpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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