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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483d147e34875a892a49a3130d2be9a57094f10f2d4ebc048cc4eacbbd452b24' 
  AND token = '1X+Ykm6II0ZsS/HVTBBnJGne8TfJQgkumAmhG09PDaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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