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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669d84fec7f1a001b3e07c1e1a8010616cd5ca9775dd8dffcceb9edef3281b54' 
  AND token = 'xfWeU+S/F2h0uzEjbjGWFa3eS+NWyAd+7+F56m7cgdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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