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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c33819838087f3d3f879c58caf26e6afdbd9e512945bda597c38be7959753f' 
  AND token = 'T97UWUeL3pJsKp4Laoic6dIANhNTH31RLEDJMo/SnPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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