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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636d9610bfee1f78f075b2ecd6b9ff50fb303894403f666f1c4eb70b1f458a39' 
  AND token = 'l98fC79B7Y53oFfACRP42l1pMW4ce84JnxUkyhrsel4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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