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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619b3b5f52a981aec4f91a4b6315955b5350a3ee1d3c34c5ea801aa9480c40e4' 
  AND token = 'xXRZq9wSl2w47rhy9c3z/R4fHL23663TtfgJtXJsERM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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