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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c063d906e028214759900b9fa99b8bcbedc5fcc3e50631d0d71a7eb0e7ef8c3' 
  AND token = 'rT0elcRDzkoVkkvN1arVyxA6kkjFOIsTneX1OQA6UN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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