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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69b1e7b03cc47f3c1e0fc4639ea43baead0f73c4d5602f8b3d63c20c16192b1' 
  AND token = 'EdGebPupD84gE+TBdFq+dkcEHrcaWdT+69UiCfi/VFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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