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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e3e7f2fe0bc10a64983f12ac6c80a3e59a446fbecdb8c156e5da82db7215cc' 
  AND token = 'JRl9yHc2fx9m6L4Ns1RAuHm55dFS2d+VNM+1BkADp6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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