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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd961259f6147c55ce6bf15444d57c3c71efdbd787ee88f91a0d1480e06b35460' 
  AND token = 'BuR7Qa+WVsHoO0v1toWSPUxUqlvvJVUjSb9F6fGjxs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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