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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83109c601713daa6293cbf10b897d1da13306ba6f204f54bf79c93ca2004343c' 
  AND token = 'aSY5oswmga7RfP2MFzoBhNq7ohsLHh1Q41deK5JUVXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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