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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca33b1f1888d941a3e5a4e1a8a32b17acb93d141d36f9d1268396f0fadc06cd0' 
  AND token = 'AObTSbnnhQTSqqnhvhv09TSD4CTTBVF08Juzyvh4YnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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