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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b13116a9a7e61c993eaed86c2701745e7f3f891933da2f6047ae8e691b2c8c' 
  AND token = 't4932Ldn9xmiN7+LiPp/bPsK6s4FsWOkk+Zyp4Vgp1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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