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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04cac6fd0a55f256b6242ce30900e65d7cb0fdca7e9563ab9ddfd0bc9ea33202' 
  AND token = 'a//6n9FhjRJXPSjztFZS4DLa5KDLv/dYLD5Z3A1LgXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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