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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c6246767864ac6238995a9f64ce123fd8d365711d606982ed232865228308d' 
  AND token = 'GvW0sWmi0cevX+bSQ8pRE+zh46HdokwiwsAhPbo+9M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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