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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7388ae123c99f3eb4bac805242f89bef77f91870c89e3d9abc532a97cbf29357' 
  AND token = 'Bk+xPuu1+K/0HsjN2ox/kXx6o2JGnEBabwC8BDKsYn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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