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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae57faf501e07b6c42eb9879b28c8db92c75dbab2eb3af86a4333e71e5abf01' 
  AND token = '0+0wCoMSb7eSQj1ntC0ZHZ2eWiDyaLEUArYUQp57oN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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