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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f59377670a028220c40ae856d648a9416b8963cc0c8c6e783360116ce33c8df' 
  AND token = 'wot7qDvaKGr48apguSXd8q1oxefDPk2fQ/loxYfNVS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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