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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3ccc9a5d419aa232ac7535a7881a585876483208f9599ef5dc43f6f961eae8' 
  AND token = '8EXhcsRXjphDtCr4BnpvtQaHxmq4Oc2BnjYDPnRK9H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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