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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ed61faeaff3dc8980b3705a25bf0dcc17237c8fa02eea0288d501e2d4ce113' 
  AND token = 'OPpg2/J1HevqX5tJrEK6F6Px/FcMMUywiHY2b3Pq/D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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