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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06755eb7d63c207fc1519d5dd291ad1e629d9b33ce60564a3505cc5bdd4ac632' 
  AND token = 'rbosgh6KRSuba7QlF3z/ohvpIplC5/Hq8s5jzu+aqF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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