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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7755df4cf0ff999e44e0f84d03214ba7e119e80b0160a3abb724a61e1558c73d' 
  AND token = 'PDzvvdnRtQz9sNagZFx4OU9utJp96+XgHv9RQCYfBkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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