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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66995db8bff18cf60f4690dcdc31f990c943ac87c73c249ee9a9081836b2cb49' 
  AND token = '7r6Ajnchf0sX+F6p7OVS3y4fjbx4Ba4Bi79/YMzUczo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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