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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a5661b50fa01f3ff961edd3b5a24c8a764198a1f123bcbd5bdb73770731c6b' 
  AND token = 'WlRhi+W4iO+KPS5PWNl5whwIETXbMoiaS/Ftm+EQIcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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