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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45346c579973239a43dd0c6742dfec6ae39e01f28b6fa451c1614aacfd36e1f' 
  AND token = 'GVfwDj+XI2R7LLfdyOuvoJqzaNl6t3hl6PtvRXRFP8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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