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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8206edf1312ff35706cb5690501accbc6bb3792945844bc388a2e4dc22075a' 
  AND token = 'fyGAxzD/h3Kt5J61GNzSn8t0t7rMBRJX+jhXMiB7U6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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