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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1580627d9fb0a22f2f6d0fa1250c4990d30e5ad78ee5924cc13d8c894cafdedf' 
  AND token = '6AbucWWUvkD/Vz/N7H11A+H7wQ6f9qCImhN7uzWGai8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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