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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2ee5efee482021dce6d26e0e91acc576e22a6f571547ff2309ec3cc4ef1cd9' 
  AND token = 'pP1paSriBwtkAqnEV8lqmdHxzJsV5Ruyc0suhcCQnso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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