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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd307022390e7ee5def2008b84b3069b82065cba3a0c7b1b79f58cd109c46fec2' 
  AND token = '5uLSWYgsRwPHDlwojQxim3z7KwVTpRs7gCznWdEWQsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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