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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cfd6dcb02f80d3ba60be571f21b1c67e15c6cce1ab7824c2b08be44e468b72' 
  AND token = 'XAwJGZg9w6+WEdGNvckgFQiU9gY4dWRkKvCel/dWc+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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