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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1218e670b29e1f77eda2daab0012fefd505b3be96482251e2b7cba9f4de4e67' 
  AND token = 'Q0yRawa8tS0e6JslmnMxstpXGfPsI0QEtPuDv/EFRjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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