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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a900ca7e19db481acdf810797570f03a44ea829ea0dff426c76afca22a8ba2f' 
  AND token = 'K9rb4Km5sYs36xoxX6AqqjmQ/1jXQa7IhVSFhgDwFzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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